by William Ralph Maxon
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Studies of tropical American ferns--no. ...
The botanical gardens of Jamaica
Studies of tropical American ferns
Untersuchungen über Selaginella spinulos...
A study of the sporangia and gametophyte...
Index Selaginellarum
Musée botanique de Leide
Edification de structures réticulées à p...
Sobre la estructura de la epidermis foli...